US1953525A - Siphon exhaust for drier rolls - Google Patents

Description

April 3, 1934. a H. YOUNG 1,953,525

SIPHON EXHAUST FOR DRIER ROLLS Filed June 13. 193i 2 Sheets-Sheet 1 April 3, 1934.

G. H. YOUNG SIPHON EXHAUST FOR DRIER ROLLS Filed June 15. 1931 2 Sheets-Sheet 2 Patented Apr. 3, 1934 UNITED STATES PATENT OFFICE SIPHON EXHAUST R DRIER, ROLLS George Harold Young, Dayton, Ohio Application June 13, 1931, Serial No. 544,247

11 Claims.

Such drier rolls comprisecylindrical drums rotating upon hollow trunnions through which" 'live steam is introduced into the interior of the roll for heating purposes and through which the spent steam is exhausted while the roll continuesto rotate. I

The drying action is efiected by :transference of heat of the live steam within the shell of the cylindrical drier roll to the sheetor Web held in contact with the external surface of the roll 2 with resulting evaporation of -moisture therefrom. The speed of operation and quantity production are directly dependent upon the rapidity of heat transference; The sheet coming from the presses is cold and wet and rapidly condenses the steam within the roll. 7

.Water, air and oil being'poor conductors of' heat interfere seriously with the drier action when a film of oil, water and sludge collects upon the inner surface of the roll. Likewise a stratum of air interposed between the steam body and the wall of the roll acts as a heat insulator materially reducing its efliciency. The formation of air pockets-causes uneven distribution of steam and the sheet-dries unevenly. Therefore when 3 the drier -;roll' contains water or is air bound, there results a'loss of production, greater steam consumption and a varying and inferior quality of paper.

The elimination of air and water of condensation from the interior of the rolls has been a constant'and troublesome problem, which is com-' plicated by the fact that the steam must be used economically. I

I The object of the present invention is to 1m- 5 ,prove the construction as well as the means and mode of operation of siphon tubes for drier rolls whereby they will not only be cheap and econom-v ical in production. but will be more efiicient in use. capable of being readily and easily inserted 0 and removed, adjustable while injuse', of greater durability and unlikely to get out of repair.

A primary object of the invention is to provide means for the constant and complete re-' moval of water of condensation and air from the drier roll whereby there will occur no airinsulation of the drying surface and no absorption of heat from the steam by water accumulation thereby insuring the action of live steam only in active circulation effectively heating the 'drier surface.

A further object of the invention is to effect rapid and'continuo'uscirculation of live steam through the roll with constant removal of condensate and air, thereby insuring steady pressure and even drying at uniform temperature with maximum efficiency and capacity.

A further object of the invention is to provide a siphon tube which may be readily adjusted from the exterior of 'the roll in its relation with the interior wall thereof while the roll is in motion.

A further object of the invention is toprovide a siphon tube and method of mounting the same which will impose a minimum strain upon the steam joint of the hollow trunnion.

A further object of the-invention is' to provide means for fixedly maintaining the intake end of the siphon in proper location and in constant relation with 'the drier wall and to prevent whipping and swaying or displacement thereof.

A further object of the invention is to effect suitable bracing of the siphon tube 'within the roll.

A further object of the invention is to effect maximum results with a siphon tube of minimum length.

A further object of the invention is to pro-' vide means for facilitating the insertion and removal .of the siphon tube and to provide a flexible tube, and means for supportingit in alined position during insertion and removal.

A further object of the inventionis'to provide an improved form of mounting for the siphon tube and an anti-friction steam joint between such mounting and the roll trunnion.

With the above primary and other incidental objects in viewas will more fully appear in the specification, the invention consists of the features of construction, the parts and combination thereof, and the mode of operation, or their equivalents, as set forth and described in the. claims. v

Referring to the accompanying drawings wherein are shown the preferred, but obviously not the only forms of embodiment of the invention, Fig. 1 is a sectionalview of a portion of a-drier roll to which the siphon tube and its mounting, forming the present invention, has been applied. Fig. 2 is an enlarged sectional view 'of the anti-friction steam joint for the drier roll which forms the mounting for the siphon tube.

Fig. 3 is a sectional view of the drier roll illustrating a modification of the siphon tube wherein the adjusting means is omitted. Fig. 4 is an enlarged detail view of the construction shown in Fig. 2 and illustrating an ordinary form of friction ring steam joint. Figs. 5 and 6 illustrate modifications of the construction shown in the preceding figures.

Like parts are indicated by similar characters of reference throughout the several views.

It has been common practice in drier roll construction to employ a rigid siphon'tube which is necessarily of relatively slight curvature in a long radius because of the restricted opening through the hollow trunnion through which the tube must be inserted. In such case the tube either does not approach sufliciently closely to the wall of the drum to keep the quantity of condensate to minimum or it is so long and heavy as to impose such great cantilever strain on the steam joint as to ,cause excessive wear and leakage. Frequently such tubes'sag until they rub upon the interior of the hollow trunnion until worn through and a leak develops destroying their-era naust action. Also such tubes sag until they drag and rub upon the wall of the drier roll increasing the friction and causingexcessive wear. The ordinary siphon tube is inaccessible for observation and adjustment while in operation, therefore such conditions are frequentlyundiscovered unhollow drier roll, the head of which is provided.

with a hollow trunnion 2 to rotate in suitable bearings (not shown) under influence of the drive gear 3 carried by the trunnion. The hollow trunnion 2- communicates at its extremity with a. manifold 4 with which it is connected by a steam tight joint which permits relative rotation of the trunnion and drum without loss of steam. The manifold 4 comprises a steam supply chamber 5 communicating directly with the hollow trunnion .2 and therethrough with the interior of the roll 1. Live steam is supplied to the chamber,5 and thence to the roll through the steam supply conduitfi which, due, to use of the antifriction type of steam joint illustrated in Figs. 1 and 2 may preferably be of flexible character. The manifold 4 contains a second chamber 7 which is an exhaust chamber communicating with the interior of the roll through a siphon tube which extends through the hollow trunnion 2 of the roll. A drain conduit 8- leads from the exhaust chamber 7 of themanifold.

The live steam admitted to the cylinder may carry with it-air and uncondensable gases and when exhaust steam from the engine is employed. such steam may carry more or less. oi. particles which accumulating within the roll form a heat insulating film upon the walls thereof. The steam by contact heats the walls of the roll over the exterior of which travels the cold and wet web of paper or other material to be dried. As the steam cools by-contact with the roll walls the water of condensation collects in the bottom of the roll. This water as well as the uncondensable gases and air must be removed to insure uniform and rapid circulation of live steam. Such is the purpose of the siphon tube.

In the present instance the siphon tube comprises an initial section 9 extending axially through the hollow trunnion 2 and a dependent intake portion 10 suspended within the roll 1 and connnected with the primary section 9 by an intermediate flexible section 11 which preferably, though not necessarily, comprises a portion of commercial woven metallic hose. The dependent intake portion 10 of the siphon tube is further interconnected with the primary section 9 by an inclined brace 12, pivotally connected at 13 with the intake section 10 and likewise pivotally connected to a sliding collar 14 upon the initial section 9. This sliding collar 14 is interconnected by a retractile spring 15 with a stationarily supported collar 16. In the form of embodiment illustrated in Figs. 1 and-2 the second collar 16 is rigidly connected by tie rods 17 with a head 18 having bayonet slot connections 19 with a hub or hollow boss 20 projecting from the manifold 4 and through which the initial section 9 of the siphon tube extends into the exhaust chamber 7 thereof. Obviously other forms of connection may be provided between the head 19 and the projecting guide boss 20. The siphon tube section '9 is preferably capable of both rotary and reciprocatory motion within the guide boss 20. The

' outer end of the tube section 9 is provided with lateral drain ports 21 for discharge of the condensate and air or gases into the manifold chamber 7 from which they are drained through the conduit 8. The extremity of the tube is connected with an operating lever 24 by astem 22 ex tending through a suitable packing gland 23. This hand lever- 24 is pivoted at 25 to a link 26 which in turn is pivoted to a support 27 rotatively mounted exteriorly of the packing gland. By means of the lever 24 the tube may be both rotated and given a to and fro reciprocatory motion. The

spring 15 yieldingly resists any inward movement of the sliding sleeve or collar 14. Normally the coils of the spring 15 are contracted substantially into contact with each other and the spring thus forms a substantially rigid abutment which resists outward motion of the sliding collar 14. By a thrust motion transmitted to the tube section 9 by the hand lever 24, whereby the tube section is slidingly adjusted inwardly through the guide boss 20 and through the collars l6 and 14, the latter being free upon the tube but held stationary by'the rods 17, the intake section 10 of the tube is oscillated about the pivotal connection 13 with the brace member 12. The brace member. is held substantially stationary during such adjustment by the collars 14 and 16 and spring 15.

. The swinging adjustment of the intake section is screw 9a or other locking device.

By giving to the tube a half rotation by rotation of the manifold head 4, the brace 12 can be turned to the top of the tube, whereupon the weight of the intake section 10 will exert a pulling strain upon the brace member 12 against the contractile tension of the spring 15, thereby drawing the sliding collar 14 away from the collar 16 and exa tending the spring 15 until the several sections 9. l0 and 11 of the siphon tube assume an alined relation as shown by dotted lines in Fig. 1, in which position the further descent of the intake section 10 will be limited by the engagement of the brace member 12 with the respective sections 9 and 10. In such alined relation, the siphon tube is very easily inserted and removed through the trunnion 2.

In association with this form of siphon tube there is preferably. though not necessarily employed an anti-friction type of steam joint illus trated in Figs. 1 and 2. In this construction the end of the hollow roll trunnion 2 is provided with a fixedly attached extension 36 having thereabout inner races 3'7 for a double series of reversely inclined bearing rollers 38 enclosed within a bearing housing 28 fixedly secured to the manifold 4 and having therein exterior roller races 29. Interposed between the bearing housing 28 and the manifold 4 is a flexible gasket 30 extending inwardly into overlapping relation with a carbon or graphite bearing ring 31 secured to the rotating extension 36 of the trunnion. The gasket 30 is held tightlyagainst the bearing ring 31 by steam pressure. Suitable packing grooves 32 are provided between the bearing housing-and the rotating part.

I This construction relieves the manifold of frictional strains or torsion and thereby permits the use of flexible steam supply and drain conduits 6 and 8.

While the capability for adjustment of the siphon tube while the roll is in operation is quite desirable, the flexibility of .the tube and support of the intake portion against whipping" or drag upon" the roll wall may be achieved as shown in Figs. 3 and 4. In such modified construction the initial section 9 is fixedly mounted in the. dividing wall between the steam supply chamber 5 and the exhaust chamber 7. of the manifold 4. The siphon tube comprises the same sections 9 and 10 interconnected by the fiexible intermediate section 11 as before. The sliding collar 14 is connected with the intake section 10 by the brace member 12 pivoted at 13 to the intake section. The same retractile spring 15 interconnects the sliding collar 14 and the collar .16 which in this instance is fixedly secured upon the tube section 9. The degree of drooping or relative relation of the intake end of the section lOand the wall of the roll is predetermined by the position of the collar 16 upon the tube section 9 which is fixedly secured thereon prior to the insertion of the tube through the hollow trunnion. By changing the position of the fixed collar 16 outwardly upon the tube section 9, the intake portion 10 may be made to droop lower or more closely approach the roll wall. Conversely by securing the collar 16 in an inward position the intake portion will be supported by the brace 12 .at greater elevation and hence farther removed from theroll wall. It will be understood that the droop or descent of the intake portion 10 and resulting retractive movement of the sliding collar 14 is resisted by the contacting coils of the spring 15 which form an abutment or limiting stop. just as they do in the formerly described construction. When it is desired to remove or insert the siphon tube. the tube is given a half rotation. which brings the brace member on top of the tube and the tube straightens out under influence of gravity and against the tensirable. It may be entirely omitted as shown in Fig. 5 wherein the sliding collar 14, to which is pivotally connected the brace 12,- abuts directly against the fixed collar 16 when the tube is in'operative position. The collar 16 may be secured in different positions thereby varying the angular relation of the intake portion 10 with the horizontal portion 9. Upon reversal of the tube the collar 14 will slide upon the section 9 s'ufliciently to enable the tube sections to assume an alined relation as before.

In Figs. 3 and 4. an ordinary form of friction steam joint is illustrated wherein a friction ring 33 is interposed between the manifold 4 and the extension member 36 upon the end of the hollow trunnion 2. The manifold 4 is connected by bolts 34 with .a clamp ring 35 surrounding the extension 25 of the hollow trunnion. thereby maintaining a steam tight revoluble bearing between the manifold and the trunnion. This type of siphon ,tube can be introduced through long bearing journals having small openings wherein a common bent pipe .cannot be installed. Theintake end of the tube will automatically assume and maintain the same relative position regardless of how many times it maybe removed and returned.

During the rotation of the drier roll. due to friction. the puddle or accumulation of water through condensation is carried slightly forwardlyand upwardly so that the water accumulation does not assume a. position exactly at the bottom v the intake section 10 of the siphon 2 to be adjusted rotatively to such extent as to reach the "greatest accumulation of water which may be slightly above the extreme bottom of the roll. Thus by a to and fro adjustment of the hand lever 24 in one direction the intake section 10 is adjusted toward and from the wall of the roll, while by a transverse oscillatory movement of ,the lever 24} the intake section may be swung to and fro in a path substantially parallel with the wall of the roll to enable its adjustment to the point of greatest accumulation. of condensate. I j

.In order to remove and replace the siphon tube,

it is necessary to disconnect the manifold head 4.

- the entire manifold head may be readily turned to a" reverse position as shown by dotted lines in Fig. 1. whereby a half rotation of the siphon tube is effected thus turning the brace 12 to theupper side of the tube and the tube tends to straighten by gravity until limited by the brace 12 as'is shown by dot and dash lines in Fig. 1.

In Fig. 5 there is shown a modification wherein the spring 15 has been omitted and a stop collar 16a is fixedly secured upon the tube section 9 to serve as an abutment for the sliding collar 14 to which the brace member "12. is pivoted. The weight of the intake section 10 is sufficient to cause such intake section 10 to descend until limsection 9 to vary the range of descent or drooping movement permitted the intake section 10. Upon half rotation of the tube!) the respective sections 9 and 10 assume an alined relation as shown by 6 dot and dash lines in which position they are supported by the brace member positioned above the tube section by the partial rotationj In Fig. 6 there is shown a construction which is substantially a-reversal of that illustrated in preceding flgures wherein the brace member 12 is fixedly pivoted to the collar 14X secured upon the tube section 9 and is pivoted to a" sliding collar 13X uponthe intake section 10 of the tube. This collar 13x abuts at one side upon a fixed stop trary to the spring 15 which. under such conditions, is extended under pulling tension.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or-sacrificing any of its ad-* vantages. While in order to comply with the statute the invention has been described in language more or less specific as to structural features, it'is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed'comprise the preferred form of several modes of putting the invention into effect and the invention is therefore claimed in any of its forms'or modifications within the legitimate and valid scope of the appended claims.

Having thus described my invention, I claim: 1. The combination with a hollow drier roll orthe like. having a hollow trunnion, of a conduit extending through the hollow trunnion including a flexible portion within the roll and resilient means for limiting the flexing action of the conduit.

2. The combination with a hollow drier roll or the like having a hollow trunnion, of a conduit extending through the hollow trunnion into the interior of the roll, a flexible joint in said conduit whereby the portion within the roll may be turned to angularly disposed relation with the portion extending through the trunnion, anda spring for deflecting the portion of the conduit within-the roll out of alinement with the portion thereof extending through the trunnion.

3. The combination with a hollow drier roll or the like, having a hollow trunnion, of a conduit extending through the hollow trunnion into the interior of the roll, a flexible joint in said conduit whereby the portion within the roll may be turned to angularly disposed -relation with the portion extending through the trunnion, a spring for deflecting the flexibly connected portionof the conduit within the roll and support-- ing means for holding the flexibly connected portions of the conduit substantially in alinement during insertion and removal of the conduit through the hollow trunnion.

4. An exhaust conduit for a drier roll having a hollow trunnion, including two flexibly interconnected sections one of which extends through the trunnion, and a brace member having flexible connection with oneof said sections and sliding engagement with the other section at opposite sides of their flexible interconnection.

5. An exhaust conduit for a drier roll having a hollow trunnion, said conduit including two flexibly interconnected portions, a brace member attached to one portion and having sliding engagement with'the other section and a distantly operated actuator extending through said trunnion for actuating one portion so as to slidingly adjust the brace member to vary the relation of the other flexibly connected portion.

6. A conduit, including two flexibly intercom nected portions, a brace member attached to one portion and having sliding engagement with the other portion, a helical spring surrounding the last mentioned portion and fixedly attached thereto at one end and attached to the sliding portion of the brace member at its other end. said spring yieldingly resisting the sliding adjustment'of the brace member as the relation .eratively connected with the brace member through. one of said portions for varying the relative adjustment of the conduit portions.

8. A conduit for a. drier roll including two flexibly interconnected portions, an adjustable brace member operatively connected with both portions thereof across their flexible intercomnection for limiting the relative angular adjustment thereof, an adjusting member for said brace, and a spring interconnecting the brace and adjusting member against the yielding resistance of which the brace is adjustable in unison with relative movement of the conduit portions independently of said adjusting member.

9. A conduit for a drier roll having a hollow trunnion, including two flexibly interconnected portions one of which extends through the trunnion, a supporting member for limiting the range of relative adjustment of said flexibly interconnected portions and an adjusting mechanism including one of said portions for varying the range of relative adjustment of the conduit portions to which the portions are limited by the supporting member, said adjusting mechanism including a control lever located outside of the roll.

scribed. the combination with a hollow drier roll or the like having a hollow trunnion. a conduit extending through the hollow trunnion into the roll including two .flexibly interconnected sections, one of which droops within the roll, and an adjustingv member actuating the section extending through the conduit by which the drooping member'may be swung in a plane substantially parallel with the axis of the roll while the latter is in motion.

10. In a construction of the character desuspended within the roll. the relative angular relation of the rigid sections being adjusted by actuating the section extending through the hollow trunnion.

GEORGE HAROLD YOUNG.

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